کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5366737 | 1388354 | 2007 | 6 صفحه PDF | دانلود رایگان |
The component and structure of CO2 corrosion scale formed on N80 tubing steel were studied by using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM); the electrochemical property of N80 steel covered by corrosion scale was investigated by electrochemical impedance spectroscopy (EIS). The results shows a double-layer structure of the corrosion scale, in which the principal component of the outer layer is FeCO3 with a limited amount of â-FeOOH; while for the inner scale, FeCO3 is still the major component, but some Fe positions in FeCO3 lattice are substituted by Ca, and form a composite compound of (Fe,Ca)CO3 in the inner scale. EIS study shows that the anodic impedance spectrum has three time constants, i.e., the capacitance at high frequency, Warburg impedance at middle frequency and capacitance at low frequency.
Journal: Applied Surface Science - Volume 253, Issue 20, 15 August 2007, Pages 8371-8376